A drag-reducing fabric based on multi-mechanism synergy, swimwear and a preparation method thereof

Abstract

The application relates to a drag-reducing fabric based on multi-mechanism synergy, a swimsuit and a preparation method thereof. The drag-reducing fabric comprises a body area and a jacquard area, the jacquard area is provided with a plurality of raised jacquard patterns, and the body area and the jacquard area are both woven by nylon covered yarn. The drag-reducing swimsuit is prepared by using the drag-reducing fabric, through pattern design, pattern making, fabric cutting and ultrasonic stitching technology. Compared with the prior art, the drag-reducing swimsuit has multi-mechanism synergy, has better drag-reducing effect, is less affected by environmental factors, and can still ensure a certain drag-reducing effect through other mechanisms when one drag-reducing mechanism fails.

Description

Technical Field

[0001] This invention relates to the field of functional clothing technology, and in particular to a drag-reducing fabric based on the synergistic effect of multiple mechanisms, a swimsuit, and a method for preparing the same. Background Technology

[0002] Drag-reducing swimming suits are a type of clothing made of special fabrics that improve swimmers' performance by reducing water resistance. Currently, reported drag-reducing swimming suits mainly employ a single drag-reduction mechanism, such as constructing surface pit structures to regulate fluid turbulence behavior (CN 114836893A), shaping the body into a streamlined shape (CN 1418585A), and surface hydrophobic finishing, thereby reducing the fluid resistance experienced by swimmers during swimming.

[0003] While applying a single drag-reduction mechanism can achieve some drag reduction, it still has many limitations. For example, the design of pits on the fabric surface can increase the gas volume fraction on its surface, thereby reducing the shear stress of fluid flowing over the fabric surface and allowing the fabric to adapt to simple fluid environments, achieving a good drag-reduction effect. However, this drag-reduction effect is highly dependent on the adhesion performance of air bubbles on the pit surface, making it difficult to maintain stable drag-reduction performance in complex fluid environments. Furthermore, drag-reduction swimsuits that rely solely on coverage are mainly based on shaping the body's streamlined form. These swimsuits use highly elastic yarns to improve the fabric's coverage of the body's muscles, thereby achieving drag reduction. However, due to the elastic deformation of the yarn, the swimsuit is prone to loosening and water trapping after repeated wear and removal, thus losing its drag-reduction effect and significantly shortening its service life. Finally, applying a hydrophobic coating to the fabric surface can also give swimsuits a certain drag-reduction effect. The mechanism mainly involves the formation of an air film in the fluid region of the hydrophobic fabric surface, replacing the solid-liquid shear phenomenon with a gas-liquid shear phenomenon, thereby achieving a drag-reduction effect. However, this type of surface coating has poor mechanical stability and is easily damaged by the friction of fluids; moreover, a large area of ​​hydrophobic surface coating will not only increase the weight of the swimsuit, but also block the pore structure of the fabric, seriously affecting the lightness and breathability of racing swimsuits.

[0004] Therefore, swimsuits made using a single drag reduction mechanism have significant limitations, and there is an urgent need to develop drag-reducing swimsuits with synergistic effects of multiple mechanisms to meet the demands of complex and ever-changing swimming speed competitions. Summary of the Invention

[0005] The purpose of this invention is to provide a drag-reducing fabric, swimwear, and preparation method based on the synergistic effect of multiple mechanisms.

[0006] The objective of this invention can be achieved through the following technical solution: a drag-reducing fabric based on the synergistic effect of multiple mechanisms, comprising a body area and a jacquard area, wherein the jacquard area is provided with multiple raised jacquard patterns, and both the body area and the jacquard area are woven from nylon spandex covered yarn.

[0007] Preferably, the jacquard pattern includes a development based on the Archimedes polyhedron.

[0008] More preferably, the jacquard pattern consists of ten regular pentagons with one side conforming to the side length of a regular decagon.

[0009] More preferably, the jacquard pattern consists of regular hexagons and squares connected by one side in a random manner, and finally rhombuses are used to fill in the empty parts of the pattern.

[0010] Preferably, the jacquard pattern consists of large rhombuses and rectangles connected by their long sides, with small rhombuses filling in the empty spaces of the pattern.

[0011] Preferably, the height of the jacquard pattern is 0.6-1.5mm.

[0012] Preferably, the nylon-spandex covered yarn consists of a core yarn and an outer covering yarn, wherein the core yarn is composed of multiple polyurethane fibers and the outer covering yarn is nylon.

[0013] Preferably, the nylon-spandex coated yarn undergoes a hydrophobic treatment.

[0014] More preferably, the nylon-spandex covered yarn is also subjected to sizing treatment.

[0015] A drag-reducing swimsuit based on the synergistic effect of multiple mechanisms, made using the aforementioned drag-reducing fabric.

[0016] A method for preparing the above-mentioned drag-reducing swimsuit based on multi-mechanism synergistic effect includes the following steps:

[0017] (1) Prepare drag-reducing fabric based on multi-mechanism synergistic effect;

[0018] (2) Drag-reducing swimsuits are prepared by pattern design, pattern making, fabric cutting and ultrasonic sewing technology.

[0019] Preferably, the method for preparing the drag-reducing fabric based on multi-mechanism synergistic effects includes the following steps:

[0020] (1-1) Yarn hydrophobic finishing: The nylon spandex covered yarn is immersed in a hydrophobic finishing agent for a period of time and then dried and baked.

[0021] (1-2) Yarn sizing treatment: Immerse the yarn treated in step (1-1) in the sizing agent for a period of time and then dry it;

[0022] (1-3) Fabric weaving and jacquard design: Using machine weaving equipment, the yarns obtained in step (1-2) are used as warp and weft yarns respectively to weave the fabric. The body area is prepared by plain weaving structure, and the jacquard area is composed of weft knitted jacquard structure.

[0023] (1-4) Fabric desizing treatment: Immerse the fabric obtained in step (1-3) in desizing agent for a period of time, then wash with hot water and cold water, and finally dry.

[0024] More preferably, the hydrophobic finishing agent in step (1-1) is a mixture of fluorinated hydrophobic finishing agent and silicon-containing hydrophobic finishing agent, a mixture of fluorinated hydrophobic finishing agent and epoxy resin-based hydrophobic finishing agent, or a mixture of silicon-containing hydrophobic finishing agent and nano-silica hydrophobic finishing agent.

[0025] More preferably, in step (1-1), the nylon spandex-covered yarn is immersed in a hydrophobic finishing agent for 12-20 minutes, then dried at 75-85°C and baked at 110-180°C.

[0026] More preferably, an antistatic agent is added to the hydrophobic finishing agent in step (1-1).

[0027] More preferably, the sizing agent in step (1-2) is a mixture of starch and soluble starch, a mixture of sodium alginate and polyvinyl alcohol (PVA), or a mixture of soluble starch and PVA.

[0028] More preferably, in step (1-2), the yarn treated in step (1-1) is immersed in the sizing agent for 12-30 minutes and then dried at 75-85°C.

[0029] More preferably, an antistatic agent is added to the slurry in step (1-2).

[0030] More preferably, the fabric weaving density in steps (1-3) is (250-340) × (270-380) threads / 10cm.

[0031] More preferably, the desizing agent in steps (1-4) is a heat-resistant amylase, sodium hydroxide, or a mixture of sodium hydroxide and hydrogen peroxide.

[0032] More preferably, in step (1-4), the fabric obtained in step (1-3) is immersed in a desizing agent for 35-60 minutes, then washed with hot water and cold water, and finally dried at 75-85°C.

[0033] More preferably, the temperature of the desizing agent in step (1-4) is 55-80°C.

[0034] This invention combines two or more of three drag-reduction mechanisms to prepare a novel drag-reducing swimsuit. The three drag-reduction mechanisms are: (1) using ultra-soft and ultra-elastic nylon-spandex blended yarn to prepare a drag-reducing fabric with enhanced and controllable elasticity and coverage; (2) performing superhydrophobic finishing on the material from the yarn end to maximize the preservation of the fabric's porous structure, thereby obtaining a durable and highly breathable drag-reducing swimsuit; (3) employing a jacquard design on the fabric surface to control fluid eddies on the fabric surface, thereby reducing eddy drag. The combined application of two or more of the above mechanisms in drag-reducing swimsuits is beneficial to achieving the best drag-reduction effect of the swimsuit.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] 1. This invention prepares a drag-reducing swimsuit based on multiple drag-reducing mechanisms by combining two or more of the single drag-reducing mechanisms. The drag-reducing swimsuit designed by this invention can reduce muscle tremors and reduce pressure drag through the shaping effect of ultra-soft and ultra-elastic high-coverage fabric. It can also minimize frictional air resistance and regulate fluid vortex behavior through surface superhydrophobic finishing or surface raised jacquard design, so that the wearer can reduce physical energy consumption during exercise and help athletes significantly improve swimming performance in competitions.

[0037] 2. The drag-reducing swimsuit of the present invention has a synergistic effect of multiple mechanisms, resulting in better drag reduction effect and less susceptibility to environmental factors. When one drag reduction mechanism fails, the drag-reducing swimsuit can still maintain a certain drag reduction effect through other mechanisms.

[0038] 3. This invention achieves optimal drag reduction in complex underwater vortex conditions by employing various irregularly shaped raised jacquard patterns on the swimsuit surface. Specifically, the raised jacquard patterns utilize grooves to lift vortices, causing them to remain above the groove ridges, thus reducing vortex initiation, entanglement, and turbulence outside the boundary layer, thereby decreasing wall shear stress. This design effectively reduces the frictional resistance of water flow on the swimsuit surface, improving the swimmer's swimming speed and underwater agility. More importantly, by rationally selecting and arranging jacquard patterns of varying sizes, it can adapt to different water flow dynamics simultaneously, thereby achieving optimal drag reduction. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the jacquard pattern design in Embodiment 1 of the present invention.

[0040] Figure 2 This is a schematic diagram of the jacquard pattern design in Embodiment 3 of the present invention.

[0041] Figure 3 This is a schematic diagram of the jacquard pattern design in Embodiment 4 of the present invention.

[0042] In the diagram: A is the body area, and B is the jacquard area. Detailed Implementation

[0043] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. These embodiments are based on the technical solution of the present invention and provide detailed implementation methods and specific operating procedures. However, the scope of protection of the present invention is not limited to the following embodiments.

[0044] Example 1

[0045] This embodiment describes the preparation of a jacquard surface drag-reducing swimsuit with superhydrophobic properties, and the specific steps are as follows:

[0046] (1) Hydrophobic finishing of yarn. A hydrophobic finishing agent is prepared by mixing a fluorinated hydrophobic finishing agent (concentration of 4.0 g / L) and a silicone hydrophobic finishing agent (concentration of 7.0 g / L) at a mass ratio of 1:2. Commercially available 2070 nylon-spandex covered yarn is preferred as both warp and weft yarns and subjected to hydrophobic treatment. The residence time of the yarn in the hydrophobic finishing agent is 12 min. Subsequently, the yarn is dried at 80°C for 5 min and then baked at 120°C for 3 min before use.

[0047] (2) Yarn sizing treatment. Starch was selected as the natural sizing agent and soluble starch as the modified sizing agent. A yarn sizing agent was prepared at a mass ratio of starch to soluble starch of 2:3. The total solid content of the sizing agent was 18%. At the same time, 4% antistatic agent was added to the sizing agent and stirred evenly. The yarn described in (1) was immersed in the prepared sizing agent for 12 minutes for sizing treatment. Then the yarn was dried at 80°C for 5 minutes and was ready for use.

[0048] (3) Fabric weaving and jacquard design. Using a machine weaving machine, the yarns obtained in (2) are used as warp and weft yarns respectively to weave the fabric. The fabric density is 330×280 yarns / 10cm. The yarns obtained in (2) are used for surface jacquard design. The jacquard pattern is a pattern design based on the development of an Archimedes polyhedron. The jacquard pattern of the fabric consists of ten regular pentagons, with one side of each decagon being a repeating unit of the jacquard pattern. Figure 1 The side lengths of the regular pentagons and regular decagons are 8mm, the jacquard width is 1.5mm, and the jacquard height is 0.6mm. This type of jacquard fabric is divided into fabric body area A and jacquard area B. Figure 1 The body area is prepared by plain weave structure, and the jacquard area is composed of weft knitted jacquard structure. The jacquard area has multiple ridge-shaped raised areas.

[0049] The specific production steps for the fabric are as follows:

[0050] S1 winding: The YK1987 ring spinning machine is used to wind the warp and weft yarns into conical yarns with appropriate density, good shape, and large capacity, whether with or without selvage.

[0051] S2 warping: A certain number of yarn cones are wound in parallel on a warp beam or weaving beam with appropriate and uniform tension according to the length, width and arrangement order specified in the process design, for use in sizing or warping processes.

[0052] S3: The warped raw material is first woven in plain weave on a GA615F series 135-180CM automatic shuttle changing loom, while the jacquard part is woven on a Honknit Macgine single-sided computer needle selection jacquard loom with a cylinder diameter of 30”-38” E20-E28 HK-SJK.

[0053] In step S1, the winding process involves 20 bobbin grooves located below each machine body, where the wound yarn is collected into bobbins by the yarn guide and guide rod. In step S2, the warping process involves segmented warping of the 2070 nylon-spandex covered yarn on a warping machine, with 8 warping heads per set. The warping tension is controlled at 7-15 cN, and the warping draft ratio is 60-80%. In step S3, the fabric density during weaving is (250-340) × (270-380) ends / 10cm, the crimp density is 32-46 / CM, the machine speed is 1500-2000 rpm, and the yarn length is 14.3cm / 100 needles.

[0054] (4) Fabric desizing treatment. A heat-resistant amylase desizing agent with a concentration of 5.0 g / L was prepared. The heat-resistant amylase was dissolved in water at 55°C under mechanical stirring and kept warm for later use. The fabric obtained in (3) was desizing treated. The fabric was kept in the desizing agent at 55°C for 35 min. Then it was washed with hot water and cold water, and dried at 80°C for 5 min to obtain a surface jacquard drag-reducing fabric with superhydrophobic properties.

[0055] (5) The drag-reducing fabric obtained in (4) is used to prepare a drag-reducing swimsuit with multiple drag-reducing mechanisms through pattern design, pattern making, fabric cutting and ultrasonic sewing technology.

[0056] (6) The drag-reducing swimsuit prepared in (5) was subjected to a hydrophobicity test, and the WCA of the swimsuit was measured to be 158°.

[0057] (7) The drag-reducing swimsuit prepared in (5) was subjected to a drag reduction test in a water tunnel. Compared with ordinary swimsuit fabric, the drag-reducing fabric prepared in this embodiment has a drag reduction rate of 5.0% in water, which is 3.0% higher than that of ordinary swimsuit fabric.

[0058] Example 2

[0059] This embodiment starts with yarn fabrication to prepare a drag-reducing swimsuit with superhydrophobic, supersoft, superelastic, and highly coverable properties. The specific steps are as follows:

[0060] (1) Preparation of ultra-soft and ultra-elastic yarn. The core yarn consists of 5 ultra-fine denier elastic filaments, which are polyurethane fibers (i.e., spandex) with a linear density of 5D. A 20D 7-hole nylon filament is selected as the outer covering yarn, with a twist direction of S. Then, the nylon yarn and the spandex core yarn are machine-wrapped, with the spandex core yarn having a pre-elongation of 1.5 and a twist of 3400 twists / m, to cover the outer surface of the spandex core yarn, resulting in an elastic yarn (nylon / spandex 20D / 7F-5D / 5F). The tensile strength at break of the nylon / spandex covered yarn is 65.6 cN, and the tensile strain at break is 203.6%.

[0061] (2) Superhydrophobic finishing of yarn. A hydrophobic finishing agent was prepared by mixing a fluorinated hydrophobic finishing agent (concentration of 5.0 g / L) and an epoxy resin hydrophobic finishing agent (concentration of 8.0 g / L) at a mass ratio of 1:1. The elastic yarn obtained in (1) was subjected to hydrophobic treatment, and the yarn was placed in the hydrophobic finishing agent for 20 min. Then it was dried at 80°C for 5 min and baked at 180°C for 3 min before use.

[0062] (3) Yarn sizing treatment. Sodium alginate was selected as the natural sizing agent and polyvinyl alcohol (PVA) as the synthetic sizing agent. A yarn sizing agent was prepared at a mass ratio of sodium alginate to PVA of 1:2. The total solid content of the sizing agent was 12%. At the same time, 4% antistatic agent was added to the sizing agent and stirred evenly. The elastic yarn obtained in (2) was immersed in the sizing agent for 20 minutes for sizing treatment, and then dried at 80°C for 5 minutes for later use.

[0063] (4) Fabric weaving. The warp and weft yarns obtained in (3) are woven into a fabric using a weaving machine with a fabric density of 340×270 yarns / 10cm.

[0064] (5) Fabric desizing treatment. Sodium hydroxide with a concentration of 9.0 g / L was selected as the alkaline desizing agent. The fabric obtained in (4) was desized, and the fabric was kept in the desizing agent for 40 min at a temperature of 65°C. Then, it was washed with hot water and cold water, and dried at 80°C for 5 min to obtain a drag-reducing fabric with superhydrophobic, supersoft, superelastic and high covering properties.

[0065] (6) The superhydrophobic, supersoft, superelastic, and highly coated fabric obtained in (5) is used to prepare a drag-reducing swimsuit with multiple drag-reducing mechanisms through pattern design, pattern making, fabric cutting, and ultrasonic sewing technology.

[0066] (7) The drag-reducing swimsuit prepared in (6) was subjected to a hydrophobicity test, and the WCA of the swimsuit was measured to be 164°.

[0067] (8) The drag-reducing swimsuit prepared in (6) was subjected to a heart-shaped flexibility test. Specifically, a strip sample of 25cm × 2cm was taken, with an effective test length of 20cm. The two ends of the sample were clamped into the clamps along the marked lines and suspended. The sample drooped into a heart shape due to its own weight. After 1 minute, the droop height between the upper plane of the clamps and the bottom outer edge of the heart-shaped sample was measured. As mentioned above, the droop height of the drag-reducing fabric was 10.8cm, which is 4.8cm higher than that of ordinary swimsuit fabric.

[0068] (9) The drag-reducing swimsuit prepared in (6) was subjected to a drag reduction test in a water tunnel. Compared with ordinary swimsuit fabric, the drag-reducing fabric prepared in this embodiment has a drag reduction rate of 6.2% in water, which is 4.2% higher than that of ordinary swimsuit fabric.

[0069] Example 3

[0070] This embodiment starts with yarn production to prepare a jacquard surface drag-reducing swimsuit with ultra-soft, ultra-elastic, and highly coated surface. The specific steps are as follows:

[0071] (1) Preparation of ultra-soft and ultra-elastic yarn. The core yarn consists of 5 ultra-fine denier elastic filaments, which are polyurethane fibers (i.e., spandex). Core yarn 1 has a linear density of 10D, and core yarn 2 has a linear density of 5D. Then, the nylon yarn and spandex core yarn are machine-wrapped. 24-hole nylon filament with a linear density of 30D is selected as the outer wrapping yarn of core yarn 1, with a twist direction of S; 36-hole nylon filament with a linear density of 40D is selected as the outer wrapping yarn of core yarn 2, with a twist direction of S. The pre-elongation of the spandex core yarn is 1.5. 30D 24-hole nylon filaments with a twist of 4000 twists / m and 40D 36-hole nylon filaments with a twist of 2400 twists / m are wrapped around the spandex core yarn to obtain elastic yarn 1 (nylon / spandex 30D / 24F-50D / 5F) and elastic yarn 2 (nylon / spandex 40D / 36F-25D / 5F), respectively. The tensile strength at break of the nylon / spandex covered yarns 1 and 2 are 62.4 cN and 41.1 cN, respectively, and the tensile strain at break is 194.4% and 303.3%, respectively.

[0072] (2) Fabric weaving and jacquard design. Using a weaving machine, elastic yarn 1 is used as the warp and elastic yarn 2 as the weft to weave the fabric. The fabric density is 250×380 yarns / 10cm. Jacquard design on the fabric surface. The elastic yarn 1 prepared in (1) above is used as the jacquard yarn. The jacquard pattern is a pattern design based on the Archimedes polyhedron unfolding diagram. Specifically, the pattern consists of regular hexagons and squares connected randomly along one side, with rhombuses filling in the remaining blank areas. Figure 2 The square, rhombus, and regular hexagonal shapes all have a side length of 10mm, a jacquard width of 3mm, and a jacquard height of 1.5mm. This type of jacquard fabric is divided into fabric body area A and jacquard area B. Figure 2The main body area adopts a plain weave structure, while the jacquard area is composed of a weft-knitted jacquard structure, and the jacquard area has multiple ridge-shaped raised areas;

[0073] The specific production steps for the fabric are as follows:

[0074] S1 winding: The YK1987 ring spinning machine is used to wind the warp and weft yarns into conical yarns with appropriate density, good shape, and large capacity, whether with or without selvage.

[0075] S2 warping: A certain number of yarn cones are wound in parallel on a warp beam or weaving beam with appropriate and uniform tension according to the length, width and arrangement order specified in the process design, for use in sizing or warping processes.

[0076] S3: The warped raw material is first woven in plain weave on a GA615F series 135-180CM automatic shuttle changing loom, while the jacquard part is woven on a Honknit Macgine single-sided computer needle selection jacquard loom with a cylinder diameter of 30”-38” E20-E28 HK-SJK.

[0077] In step S1, the winding process involves 20 bobbin grooves located below each machine body, where the wound yarn is collected into bobbins by the yarn guide and guide rod. In step S2, the warping process involves segmented warping of nylon / spandex 30D / 24F-50D / 5F raw materials on a warping machine, with 8 warping heads per set. The warping tension is controlled at 7-15 cN, and the warping draft ratio is 60-80%. In step S3, the fabric density during weaving is (250-340) × (270-380) ends / 10cm, with a crimp density of 32-46 / CM; the machine speed is 1500-2000 rpm.

[0078] The yarn lengths are 14.3cm / 100 stitches for nylon-spandex 30D / 24F-50D / 5F filament yarn and 17.6cm / 100 stitches for nylon-spandex 40D / 36F-25D / 5F filament yarn.

[0079] (3) The ultra-soft, ultra-elastic, high-coverage jacquard drag-reducing fabric obtained in (2) is used to prepare a drag-reducing swimsuit with multiple drag-reducing mechanisms through pattern design, pattern making, fabric cutting, and ultrasonic sewing technology.

[0080] (4) The drag-reducing swimsuit prepared in (3) was subjected to a drag reduction test in a water tunnel. Compared with ordinary swimsuit fabric, the drag-reducing fabric prepared in this embodiment had a drag reduction rate of 6.4% in water, which is 4.4% higher than that of ordinary swimsuit fabric.

[0081] Example 4

[0082] This embodiment starts with yarn fabrication to prepare a jacquard surface drag-reducing swimsuit with superhydrophobic, supersoft, superelastic, and highly coated surface. The specific steps are as follows:

[0083] (1) Preparation of ultra-soft and ultra-elastic yarn. The core yarn consists of 5 elastic filaments, which are polyurethane fibers (i.e., spandex). Core yarn 3 has a linear density of 10D, and core yarn 4 has a linear density of 5D. Then, 24-hole nylon filaments with a linear density of 30D and 36-hole nylon filaments with a linear density of 40D and a twist direction of S are selected as the outer covering yarns. Next, the nylon yarn and the spandex core yarn are machine-wrapped. The pre-elongation of the spandex core yarn is 1.5. The 24-hole nylon filaments with a twist of 4000 twists / m and the 36-hole nylon filaments with a twist of 2400 twists / m are wrapped on the spandex core yarn to obtain elastic yarns 3 (nylon / spandex 30D / 24F-50D / 5F) and 4 (nylon / spandex 40D / 36F-25D / 5F), respectively. The tensile strength at break of the nylon-spandex covered yarns 2 and 3 are 70.6 cN and 41.1 cN, respectively, and the tensile strain at break is 303.8% and 303.3%, respectively.

[0084] (2) Superhydrophobic finishing of yarn. A hydrophobic finishing agent is prepared by mixing a silicon-containing hydrophobic finishing agent and a nano-silica hydrophobic finishing agent at a mass ratio of 1:1, wherein the concentration of the hydrophobic finishing agent is 15%, and 4% of antistatic agent is added to the slurry and stirred evenly. The elastic yarns 3 and 4 prepared in (1) are subjected to hydrophobic finishing. The yarns are soaked in the hydrophobic finishing agent for 15 minutes, and then dried at 80°C for 5 minutes and baked at 150°C for 3 minutes before use.

[0085] (3) Yarn sizing treatment. Soluble starch was selected as the modified sizing agent and polyvinyl alcohol (PVA) was selected as the synthetic sizing agent. The yarn sizing agent was prepared at a mass ratio of 2:3. The total solid content of the sizing agent was 14%. The elastic yarn obtained in (2) was immersed in the sizing agent for 30 minutes for sizing treatment, and then dried at 80°C for 5 minutes for later use.

[0086] (4) Fabric preparation and jacquard design. Elastic yarn 3 (nylon / spandex 30D / 24F-50D / 5F) was used as the warp yarn, and elastic yarn 4 (nylon / spandex 40D / 36F-25D / 5F) was used as the weft yarn for weaving. The fabric density was 250×380 yarns / 10cm. Subsequently, elastic yarn 3 was selected as the jacquard yarn. The jacquard pattern consisted of large rhombuses and rectangles connected adjacent to each other along their long sides, with small rhombuses filling in the empty areas of the pattern. Figure 3 The large rhombus has a side length of 20mm, the small rhombus has a side length of 10mm, the long side of the rectangle is 20mm, the short side is 10mm, the jacquard width is 2mm, and the jacquard height is 1.2mm. The body area adopts a plain weave structure, while the jacquard area consists of a weft-knitted jacquard structure with multiple ridge-shaped raised areas.

[0087] The specific production steps for the fabric are as follows:

[0088] S1 winding: The YK1987 ring spinning machine is used to wind the warp and weft yarns into conical yarns with appropriate density, good shape, and large capacity, whether with or without selvage.

[0089] S2 warping: A certain number of yarn cones are wound in parallel on a warp beam or weaving beam with appropriate and uniform tension according to the length, width and arrangement order specified in the process design, for use in sizing or warping processes.

[0090] S3: The warped raw material is first woven in plain weave on a GA615F series 135-180CM automatic shuttle changing loom, while the jacquard part is woven on a Honknit Macgine single-sided computer needle selection jacquard loom with a cylinder diameter of 30”-38” E20-E28 HK-SJK.

[0091] In step S1, the winding process involves 20 bobbin grooves located below each machine body, where the wound yarn is collected into bobbins by the yarn guide and guide rod. In step S2, the warping process involves segmented warping of nylon / spandex 30D / 24F-50D / 5F raw materials on a warping machine, with 8 warping heads per set. The warping tension is controlled at 7-15 cN, and the warping draft ratio is 60-80%. In step S3, the fabric density during weaving is (250-340) × (270-380) ends / 10cm, with a crimp density of 32-46 / CM; the machine speed is 1500-2000 rpm.

[0092] The yarn lengths are 14.3cm / 100 stitches for nylon-spandex 30D / 24F-50D / 5F filament yarn and 17.6cm / 100 stitches for nylon-spandex 40D / 36F-25D / 5F filament yarn.

[0093] (5) Fabric desizing treatment. Prepare an alkaline-oxygen composite desizing agent with a sodium hydroxide concentration of 5.0 g / L and a hydrogen peroxide concentration of 10.0 g / L and keep it at 80°C for later use; immerse the jacquard fabric obtained in (4) in the desizing agent for 60 min, then wash with hot water and cold water, and dry at 80°C for 5 min to obtain a superhydrophobic, supersoft, superelastic high-coating drag-reducing fabric with a raised surface structure;

[0094] (6) The fabric obtained in (5) is used to prepare a drag-reducing swimsuit with multiple drag-reducing mechanisms through pattern design, pattern making, fabric cutting and ultrasonic sewing technology.

[0095] (7) The drag-reducing swimsuit prepared in (6) was subjected to a hydrophobicity test, and the WCA of the swimsuit was measured to be 155°.

[0096] (8) The drag-reducing swimsuit prepared in (6) was subjected to a heart-shaped flexibility test. Specifically, a strip sample of 25cm × 2cm was taken, with an effective test length of 20cm. The two ends of the sample were clamped into the clamps along the marked lines and suspended. The sample drooped into a heart shape due to its own weight. After 1 minute, the droop height between the upper plane of the clamps and the outer edge of the bottom of the heart-shaped sample was measured. As mentioned above, the droop height of the drag-reducing fabric was 11.8cm, which is 5.8cm higher than that of ordinary swimsuit fabric.

[0097] (9) The drag-reducing swimsuit prepared in (6) was subjected to a drag reduction test in a water tunnel. Compared with ordinary swimsuit fabric, the drag-reducing fabric prepared in this embodiment has a drag reduction rate of 7.5% in water, which is 5.5% higher than that of ordinary swimsuit fabric.

[0098] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any related products whose yarn specifications, fabric specifications, and drag reduction mechanisms are within the scope of the present invention, or whose related products are directly or indirectly applied to other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A drag-reducing swimsuit based on the synergistic effect of multiple mechanisms, characterized in that, Made of drag-reducing fabric, which includes a body area and a jacquard area, the jacquard area having multiple raised jacquard patterns, both the body area and the jacquard area being woven from nylon spandex covered yarn. The jacquard pattern includes a development diagram based on the Archimedes polyhedron. Alternatively, the jacquard pattern consists of large rhombuses and rectangles connected with their long sides adjacent to each other, with small rhombuses filling in the empty parts of the pattern; The height of the jacquard pattern is 0.6-1.5mm; The nylon-spandex covered yarn undergoes a hydrophobic treatment. The method for preparing the drag-reducing swimsuit based on multi-mechanism synergistic effect includes the following steps: (1) Prepare drag-reducing fabric based on multi-mechanism synergistic effect; (2) Drag-reducing swimsuits are prepared by pattern design, pattern making, fabric cutting and ultrasonic sewing technology; The method for preparing the drag-reducing fabric based on multi-mechanism synergistic effect includes the following steps: (1-1) Yarn hydrophobic finishing: The nylon spandex covered yarn is immersed in a hydrophobic finishing agent for a period of time and then dried and baked. (1-2) Yarn sizing treatment: Immerse the yarn treated in step (1-1) in the sizing agent for a period of time and then dry it; (1-3) Fabric weaving and jacquard design: Using machine weaving equipment, the yarns obtained in step (1-2) are used as warp and weft yarns respectively to weave the fabric. The body area is prepared by plain weaving structure, and the jacquard area is composed of weft knitted jacquard structure. (1-4) Fabric desizing treatment: Immerse the fabric obtained in step (1-3) in desizing agent for a period of time, then wash with hot water and cold water, and finally dry. The fabric surface is designed with jacquard to control the fluid vortex, thereby reducing vortex drag.

2. The drag-reducing swimsuit based on multi-mechanism synergistic effect according to claim 1, characterized in that, The jacquard pattern consists of ten regular pentagons, with one side fitting the side length of a regular decagon; Alternatively, the jacquard pattern consists of regular hexagons and squares connected by one side in a random manner, with rhombuses filling in the empty parts of the pattern.

3. The drag-reducing swimsuit based on multi-mechanism synergistic effect according to claim 1, characterized in that, The nylon-spandex covered yarn consists of a core yarn and an outer covering yarn. The core yarn is composed of multiple polyurethane fibers, and the outer covering yarn is nylon.

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